feat(OAuthFailureHandler): 로그 추가

Author: m-a-king

src/main/java/com/somemore/auth/oauth/handler/failure/CustomOAuthFailureHandler.java

@@ -17,5 +17,7 @@ public class CustomOAuthFailureHandler extends SimpleUrlAuthenticationFailureHan
     public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) {
         // TODO 프론트엔드와 협의
         log.error("안녕 난 말하는 감자야");
+        log.error(exception.getMessage());
+        log.error(exception.getCause().getMessage());
     }
 }